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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62de82609a1423a86229464dcbdc2021db98723260d30a8d057fee29e5933cb' 
  AND token = 'JWXNnHnCKTnFVFKsxBLyL7Mp6vOc6VHJn4iRpNf0XP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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