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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc3d8dbcec5ec881158581c5ad2948ef736f44106b03b0cb1a7feb4112f2d45' 
  AND token = 'bH9g0mXx+ml9lOd7/sWx8rUOxUM6Fx8X1dyMnvnqKjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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