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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8600cf58836bd1544a711d5d9e450e41ac0c085374212ea3a45b349f73d52b' 
  AND token = 'uUyxpVzgsG5qWin76iMDH6Z9qobbhGI2aoznBVQUiu8=' 
  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"
    }
  }
}