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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286ec08b80a5bf582292691d1f2f1f112ab48c444c1bb80d9d6f09ff3bac6d91' 
  AND token = '9UcKtMFv9Luc1CONIqdlrihTKDsoxIBw4TnlEBLY1i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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