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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e56861f56d953184a987caa3c9d93e9d5b1265a8bbbf6d46525a3772dead952' 
  AND token = 'AfvHY1CJDUsvsi0QAAi1jZiEUTjOA6OlrkI/6h9i0QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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