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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48912c76363c9caf97e3fec16246537fa02156e191bd9101a337dd051f5a9a84' 
  AND token = 'HCjcaxDhzzadjV8IcE6/FvuXNo/Y6gHY3n1N/0F0NPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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