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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc21bea7b9e43f1cb52efd10ba539bea26af4ea1020f48cb6522eeed293ebf0' 
  AND token = 'RtAtB0Lm3GB546MS5HJOr+kbCZIv2fqIDzw5SvI3l+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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