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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667bec1c18d7008e0c76d0f4a8869762a4a3fb5dc545c9a8e0ea72e3a80bbeb6' 
  AND token = 'SVjox14auEWZkJ+uKJKQ/JnW8ywNMwxAGhPM1pq56aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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