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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2ca15669613a789b68beb5cf0e55029a4be43e24e04ab87d0c1891cb396497' 
  AND token = 'e3s4dfEtTzEk7+Vh2ZiKeWRRAFjLKZPuzRRdudjwaYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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