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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaa1c5cc2537ab30085876d2e5ba04e1910cee4b4d1a806eed83bff4493e027' 
  AND token = 'cXYIrgYV0BtrSjyLL9WMbM4eAT+EzDH6/UxPjwPBRuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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