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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c211ed21b268ca04f7e2bf8bdb4f661a9c5de8e884212a07002a1e5cebc05f95' 
  AND token = 'FRmGnNtR6g+9rraRj7mJ+z9fQBgr6oTaUFDEZGb5MKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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