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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a790232ca6c147954246c0b067140a3b1e8f3f2984f347a6249bdc8d92e6ea' 
  AND token = 'yuonBzRKSmOZ8Xn6vcq1dnIFnexnsMOZlpLINs1ELic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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