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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72dde5ef16a40106b1d6a5363d1385c1c8b165042fe975f9987aa948fba1073' 
  AND token = 'Hl5LhNsC3VIjUsDrMBUAO1OMrTKcXbEN6m3dfHz1I8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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