SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960d42483c47b6cd137a010298e3d360e9bba6f55d891d73a62335d1870f887c' 
  AND token = 'Ti/Geq+hpRWekbKNlCt/vnVXZFOQ8If4Bh+6del5g0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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