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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f41dd9706f34b9299948882e79cf2ba89c7163675642cf4049616b56989c46f' 
  AND token = '5lN+ZaI+EGAQ0pbiT1CKzf0ejnpcvljG7HpB35P7vmo=' 
  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"
    }
  }
}