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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7d4f05421050bc01d8c1084e1813ad7e5f2c2f26e3d435493bdf9d64327032' 
  AND token = 'OJGLeAMDwId2mM9vI4owjC7yZiP1G7dBPgIsMnbg7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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