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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa858a060924fc77547915eb41bb049ead7f34e22d73d9024dedf05a6de1b4c8' 
  AND token = 'fsHup+jjb8BEOQVcDhO6f857eJK0n+5kC2On1zUxKBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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