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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54216eabf9044b2d2a94908efd5339d0201674730106771d4b0e2e7725399ef9' 
  AND token = 'Ri16njrK0ZY8DAKVc/Gp4WKhtULH5HnNZ48Hpn5P1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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