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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1873b9abebe94c0457e5c72d7024b3710dde18431e936b4451fd75cf79c757a2' 
  AND token = '3LAU86uWgwmWBn6NUlWSaJR/OOzv3xw03fy+xcI60ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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