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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4ee22c473d6f0d4dd15fe63cc2d560e22f9b5d2e85ee5e4255599fade1ca86' 
  AND token = '0ekOaz7y9cxM48QBf7bc72l1YJ+2839D6IEVz7TwUow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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