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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73e9b9b1e78d7848d67d23bb2ec1f0f7c033588f043ba4d4c2d68176675ab10' 
  AND token = 'XYCjCR68+Bfd8DI/fZb7nfDIIu4xvNH/e1MxCUITbTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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