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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72bb787f99b2ea7b198a2412ff655a8d434ca1a043a67291ce04215ae90aeb0' 
  AND token = 'vUV2g7do4IHQF8EsekAU4AfFbeVVddpq5tC40ANsjkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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