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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bd4bb7a15eb585cb0690e1cc3daf316654c9b4cc197dc9b470b2ff00247188' 
  AND token = '1qrulaiNOX2hNz9cofyt/Ok6rNozyhIBW1pc5X6/euc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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