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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90ed5994eeeb02d1457a38083052dca84bfb1fa30d7665146cdf27128f956fb' 
  AND token = 'QmicVPh/lLYdyPu+kh9Tux/K6Hf8kepq2g9O8nraNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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