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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84e526ae85ce9cbd662c13b512d2784aa841e4c9e940e7080270bda372934e5' 
  AND token = 'SkJ0y4zuppK73KXAAQI/foq3dj+iCa6LwXu2bImb364=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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