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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211f03f706ec22a45792fce391605dc7cb959afc3ee43893bcb89fad4424983b' 
  AND token = '4pT7uh9gBfawY1b/+utuusnXmXjuu9dPUCQQ7SPTtBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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