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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24293f540dc1fc2de097d02b5ac8110b09883b0e0ba9ada7fd4dc6b300f80d97' 
  AND token = 'a3dnIAI6wIhE5+dGGXgi0GROAXcY4yqopSi1RKdNuS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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