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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99ea9b28a5f67edd08d60e12adb339e952c9238f5fdd50a96dcabc7eb05ce0b' 
  AND token = 'I8ew6TeihN4UaV5d3POM+YEAvWyP3czuKnPugB0U2mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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