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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b8d831e5e48b2a9f84372001be9136f230e79b91eca408b9750b564759824b' 
  AND token = 'EkRMPBCkWvdpV6gtgVPRslxtWqAdL6XzDkJ6CmsFsHI=' 
  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"
    }
  }
}