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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab705bc99e19b8feb950fd2c40625273003263d45e1cdd0e8979a3df70f5ccf3' 
  AND token = '+RCwmCjSv0bAYk0yKJVAX5EpiQcp8i2YgflgCkYapSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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