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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97bc4773dcf4d61462434e55964116cf28c68116a3f4cecd96cf17c7933781f' 
  AND token = 'UN7pvh0uQUGnzEXm69H8stZ8s1yqkP95qJ1m6rOLpGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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