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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf886bebff50e35dbb4298e7bf89bc69da97477de1e67b473b945b4bef45dcd' 
  AND token = 'KeLR1WA7c9n/okUMc8i4LYbXKdQnePcdQ/9eZvoeEO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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