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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b2b39e6eb74f3dd13af56d853d62d271fa99034fea850a1d623f67f8c066bc' 
  AND token = 'fljn4bBpTa3FlYxGk5w4RY2Ape02Ag5wwECaV33MBF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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