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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30d4136a0628417e5f7ab625e8854833d3b1fa48f22a02ee644cbadc8eec53b' 
  AND token = 'JTfAmQYx/O0zo/k0pAUMOSHwq9R3hS3elzMY3Y54XrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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