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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99724c77be3952b82ff1019dfecbaf971b7c3385a1b191f6505ab40b434a598c' 
  AND token = 'q/BF04aEgtuHLa0aDQ/e8l5xP7mDUrr7W1I1uiQ08Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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