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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baf2dc64d525f823d9501741c6eaf80e3e82af6e48afbd6bc4be7b4f5df6cdc' 
  AND token = 'vc8dbI4c2REkZUF0h7kBIhwRiaxOcTS1w7Fir4WZ5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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