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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baddaf5c0075863a54d0230e2564e3b0734b0bd153bf1f2459e3f2719a4c1408' 
  AND token = 'DtGtWDy5B7JJflfP6m0fiCl2BgPbFflL6iphgd47rmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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