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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2c43573f53159e22732ede7fb7d74ae4d6a58f45ed00945630ba98a76964c7' 
  AND token = 'X2hHRA4kOcbQZULFQJcPC32yx8VtUTy28Mlcknwh16s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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