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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b4bdfb16eda422dc416901a3ba3b4470a524bbf5d518859db7fa0d2910fffd' 
  AND token = 'tEQbWJuMnCHQytEpZQ8Hb1CY1EO0szJQSxKFroFM0p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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