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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b1bad6b38897170b8398eca68510ea5b75b26066540b327a2a96e0d262878d' 
  AND token = 'yQXWtFGj8yA2Oe5icrn38fjU+x38i5/UOVIthAgcI0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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