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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae3f3268de8a4b406a62bade01b1aa3489c2506df74ac7a6753324ac7135781' 
  AND token = 'cPEiT+/41q3YjOP3p3op17Mf5TqIIK4OSJ6kwJcX/8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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