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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb60ef33a35bc88b80be1c94330e0af0527c2945b878ba702fde7fb23c6922d' 
  AND token = 'n0Wc6hCbDNcQEgR8UGtDTJhAmNILbY9IZtdc2H7F8UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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