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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6f7251bae4c2290a15ded4cb8b8fc6e78546f112ce6fbc41040f066e3ab05' 
  AND token = 'e1++1P0Y7OTfDRy9fW4ZfGyZq9GKBEsFgIYPAXdBt1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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