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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06d3fd93647c4c1f886649871860c0be4592a534449f57831ed7ef034a61470' 
  AND token = '7hoEFFoK0+LdOLODqOqNw2pq0051trJgBQPML+p5A9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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