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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c86f8962ce2af4f2c424ff1c85ee0493bb951e1e9551a37f9e7146c4159bb8' 
  AND token = 'pSdF0deri1fWeSjhstVBIIGxAuxe0JIgPZz/oKZ9HyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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