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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a5d182c8a8ace4a9956f6a569268263ba2e0ba32b38d48a6ba117aeb50885b' 
  AND token = 'WjutZcW58jOWZa7u3KO3IK/XR9DZ3YJvaGrtlE0QNlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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