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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770fab0fd2f6a9b335d2dce2e663dc59903d584a5a3069f60b79bfc42be6d432' 
  AND token = 'I4XYf5fsYqQ6KGCVM+bbNEDaIFNqtrSlxRXLR++GBBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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