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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819bbc956a56557b3ba1657d0879603bff352ad0c368f51bf35f01055fb4bd86' 
  AND token = 'OlinyED+GFzhRclMXm8/qZA8EnwOcae5MbeIL+B+chY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}