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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bd87b72626ffe1254191556d06c35ac7c4cf1e98e769b5c8f9ed295d39f8b5' 
  AND token = 'soz35wi29RUXGg4ZvbB0d40jxK7yCC0eNcnHTXRKfgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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