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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10d588c3d3c81bd3240d74068986ce8d880aad92263f1f16312d0ad67acd525' 
  AND token = 'JgrHyWn6mfpP/xIMa6xV4nedZLYDqGS4mYUl/JVrbrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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