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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a349b7574430050b75b53f2f0431d8ecac45e81ee588593a5ae2f7bad9668763' 
  AND token = 'PG4O8481/bNGU3R4ey2LOowNzQ9gmw/G3m4aFdt1+xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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