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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490a0f0ba1eebeb254158a2831ffae2ed5e8e18f2f676ef8ae211e686477eb46' 
  AND token = 'N2A7cvGBS4WJGgzRCreIPAF2EioxgLh+3HMaNAkkZfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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