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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e414d8823a31de94ce7b3d3de89408eba20736e4c8dc9692b7f33471673ad73' 
  AND token = 'AaVUY4/wo0rWM77/QjP6UpBmcL12R75S1JZyLWRi1C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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